/**
 * Copyright 2019 吉鼎科技.

 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.easyplatform.spi.engine;

/**
 * @author <a href="mailto:davidchen@epclouds.com">littleDog</a> <br/>
 * @since 2.0.0 <br/>
 */
public abstract class EngineFactory {

    private static EngineFactory instance = null;

    static {
        try {
            instance = (EngineFactory) Class.forName(
                    "cn.easyplatform.engine.EngineFactoryImpl").newInstance();
        } catch (Exception ex) {
            instance = null;
        }
    }

    public final static Engine me() {
        if (instance == null)
            return null;
        return instance.getEngine();
    }

    protected abstract Engine getEngine();
}
